Disable argument type optimization for named parameters.

dart/lib/compiler/implementation/ssa/builder.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 class Interceptors {
   Compiler compiler;
   Interceptors(Compiler this.compiler);
 
   SourceString mapOperatorToMethodName(Operator op) {
     String name = op.source.stringValue;
@@ skipping 201 matching lines @@
         if (signature.optionalParameterCount > 0) {
           defaultValueTypes =
               new OptionalParameterTypes(signature.optionalParameterCount);
           int index = 0;
           signature.forEachOptionalParameter((Element parameter) {
             Constant defaultValue = compiler.compileVariable(parameter);
             HType type = HGraph.mapConstantTypeToSsaType(defaultValue);
             defaultValueTypes.update(index, parameter.name, type);
             index++;
           });
+        } else {
+          // TODO(ahe): I have disabled type optimizations for
+          // optional arguments as the types are stored in the wrong
+          // order.
+          HTypeList parameterTypes =
+              backend.optimisticParameterTypes(element.declaration,
+                                               defaultValueTypes);
+          if (!parameterTypes.allUnknown) {
+            int i = 0;
+            signature.forEachParameter((Element param) {
+              builder.parameters[param].guaranteedType = parameterTypes[i++];
+            });
+          }
+          backend.registerParameterTypesOptimization(
+              element.declaration, parameterTypes, defaultValueTypes);
         }
-        HTypeList parameterTypes =
-            backend.optimisticParameterTypes(element.declaration,
-                                             defaultValueTypes);
-        if (!parameterTypes.allUnknown) {
-          int i = 0;
-          signature.orderedForEachParameter((Element param) {
-            builder.parameters[param].guaranteedType = parameterTypes[i++];
-          });
-        }
-        backend.registerParameterTypesOptimization(
-            element.declaration, parameterTypes, defaultValueTypes);
       }
 
       if (compiler.tracer.enabled) {
         String name;
         if (element.isMember()) {
           String className = element.getEnclosingClass().name.slowToString();
           String memberName = element.name.slowToString();
           name = "$className.$memberName";
           if (element.isGenerativeConstructorBody()) {
             name = "$name (body)";
@@ skipping 4238 matching lines @@
           new HSubGraphBlockInformation(elseBranch.graph));
 
     HBasicBlock conditionStartBlock = conditionBranch.block;
     conditionStartBlock.setBlockFlow(info, joinBlock);
     SubGraph conditionGraph = conditionBranch.graph;
     HIf branch = conditionGraph.end.last;
     assert(branch is HIf);
     branch.blockInformation = conditionStartBlock.blockFlow;
   }
 }